1. University Clinical Centre of Serbia, Pacemaker Centre , Belgrade , Serbia
2. Faculty of Medicine, University of Belgrade , Belgrade , Serbia
3. Heart Rhythm Department, Clinique Pasteur , 31076 Toulouse , France
4. Universitair Ziekenhuis Brussel—VUB, Heart Rhythm Management Centre , Brussels , Belgium
5. INSERM U970 , 75908 Paris Cedex 15 , France
6. Department of Physiology, Maastricht University , Maastricht , The Netherlands
7. Epicura Centre Hospitalier , Hornu , Belgium
8. Department for Cardiovascular Diseases, University Hospital Center Split , Split , Croatia
9. Cardiology Department, Fondazione Cardiocentro Ticino , Lugano , Switzerland
10. Cardiac Pacing Unit, Cardiology Department, University Hospital of Geneva , Rue Gabrielle Perret Gentil 4, 1205 Geneva , Switzerland